The peritrophic membrane (PM) is a film-like structure that separates food from midgut tissue, composed of chitin and proteins. It protects the epithelium against food abrasion and microrganisms and has other functions based on compartimentalization of enzymes.
Is Peritrophic membrane present in cockroach?
A stomodeal valve is present at the junction of gizzard and mesenteron. … The food bolus in the mesenteron is enveloped by a porous, mesh like membrane called peritrophic membrane which is secreted by the glandular cells of anterior part of the mesenteron.
Which enzyme can pass through the Peritrophic membrane?
These pathogens secrete chitinase and proteinase enzymes which dissolve the chitin microfibrils and proteins present in the peritrophic matrix. These enzymes open large holes in the membrane, allowing the pathogen to infect the epithelium and other tissues in the insect.
What is the midgut?
The midgut consists of the distal half of the duodenum, jejunum, ileum, cecum, ascending colon, and the proximal half of the transverse colon (Figure 10-1A). Branches of the superior mesenteric arteries and veins provide the primary (but not exclusive) vascular supply for the midgut (Figure 10-1B).
Which structure of alimentary canal of cockroach is used for storing of food?
The Foregut of the alimentary canal has crops and gizzard. Crop is used for food storage. Gizzard helps in grinding of food particles.
Are Cockroaches Ureotelic?
– As cockroaches are reptile insects and Cockroaches excrete nitrogenous compounds as waste material or we can say cockroaches excrete uric acid as waste material, which is why they are known as Uricotelic insects. Hence from the above discussion, it can be concluded that the cockroaches are uricotelic.
What structure protects the midgut from abrasion by food particles?
The PM is a physical barrier, protecting the midgut epithelium from abrasive food particles, digestive enzymes, and pathogens infectious per os. It is also a biochemical barrier, sequestering and, in some cases, inactivating ingested toxins.
What is the chemical composition of cuticle of insect?
Insect cuticle is a layered, fibrous composite of chitin, water, protein, catechol, lipid and occasionally metal and mineral, secreted by a single layer of epidermal cells (Vincent and Wegst, 2004).